Feature:1. USB bluetooth adapter allows the computer to have Bluetooth, realize wireless transmission and sharing.2. Support for WINDOWS ALL/OS X/LINUX system, support for iphone earphone of the 3rd generation.3. Achieve higher sensitivity, faster transmission speed, and more stable device connection.4. Realize the connection between the computer and other Bluetooth‑enabled devices.5. After the device is successfully matched for the first time, it will automatically connect after the subsequent startup.Specification:Item Type: USB Bluetooth AdapterMaterial: ABSColor: As Picture ShownWeight: Approx. 12.0g/0.4ozBluetooth Version: Bluetooth 5.0Bluetooth Chip: for BR8041Transmission Distance: About 10mScope of Application: Support for WINDOWS ALL/OS X/LINUX system, support for iphone earphone of the 3rd generation.Function: Computer Bluetooth ExpansionHow to use:1. Confirm whether the transmitter you purchased is the call version2. Insert the transmitter into the USB port of the computer, the red and blue lights flash alternately3. Turn on the pairing status of the Bluetooth headset/speaker4. Wait for the transmitter to automatically pair with the Bluetooth headset and speakers (the computer does not require any operation)5. After the pairing is completed, the red light of the transmitter is always on6. Some computers need to set the sound output channel, or plug it in again.Package List:1 x USB Bluetooth Adapter1 x Manual